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son of a gun

1 ENTRIES FOUND:
son of a gun noun
plural sons of guns
son of a gun
noun
plural sons of guns
Britannica Dictionary definition of SON OF A GUN
US, informal
[count] : a person (especially a man) or thing that you are annoyed with
old-fashioned used by a man to address a male friend
used to express mild surprise, disappointment, etc.